3. dynamics 1, 4. dynamics 2

Question 1

mass

Answer 1

measure of amount of matter in a body

Question 2

weight

Answer 2

gravitational force acting on an object that has mass

Question 3

gravitational field

Answer 3

a region in which a mass experiences a force due to gravitational attraction

Question 4

gravitational field strength

Answer 4

gravitational force per unit mass placed at that point

Question 5

newton’s first law

Answer 5

every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it

Question 6

newton’s second law

Answer 6

when a resultant force acts on an object of constant mass, the object will accelerate in the direction of the resultant force

Question 7

newton’s third law

Answer 7

every force has a reaction force of equal magnitude and acts in the opposite direction

Question 8

inertia

Answer 8

reluctance of an object to change its state of rest or motion due to its mass

Question 9

terminal velocity

Answer 9

the constant speed an object starts to travel at when air resistance acting on an object equals its weight

Question 10

friction

Answer 10

the contact force that opposes or tends to oppose motion between surfaces in contact